Communications: directive radio wave systems and devices (e.g. – Radar ew
Patent
1995-09-08
1997-08-26
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar ew
342 21, 342175, 342194, 342100, G01S 7285
Patent
active
056614853
ABSTRACT:
An apparatus and method of homodyne reception includes power divider circuitry for providing first and second signals from an input signal. Oscillator circuitry generates first and second oscillator signals. The first signal and second oscillator signal are mixed and the second signal and the second oscillator signal are mixed in first and second modulator circuitry, respectively, to provide first and second mixed signals which are further mixed together in image reject mixer circuitry. Amplifiers are used to amplify one of the signals before it is mixed with an oscillator signal and to amplify one of the mixed signals before it is mixed with the other mixed signal in the image reject mixer circuitry. In each of the mixing steps of the preferred embodiment is a filter which filters out spurs in the signals. Another embodiment of the homodyne receiver of the present invention is a multiple channel homodyne receiver comprising a plurality of RF channels, a common lower sideband conversion channel and a common offset oscillator assembly.
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James Bao-Yen Tsui, Microwave Receivers and Related Components, John Wiley and Sons, 1986, p. 59.
Stephen E. Lipsky, Microwave Passive Direction Finding, John Wiley and Sons, 1987, pp. 202-203.
Condor Systems, Inc.
Johnson J. Michael
Sotomayor John B.
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